SG6203SZ
SG6203SZ Datasheet
SG6203
| Part | Datasheet |
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SG6203SZ |
SG6203SZ (pdf) |
| Related Parts | Information |
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SG6203DZ |
SG6203DZ |
| PDF Datasheet Preview |
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| Synchronous Rectifier Controller for Flyback Converter Product Specification SG6203 - Current shunt - RC network for better efficiency Flyback converters, such as - Power adaptors - Open-frame SMPS The SG6203 is designed to control and drive the synchronous rectifier for the flyback converter. The synchronous signal of the primary switch is obtained by a single diode connected between the transformer secondary winding and the SG6203. Using the SG6203, no additional transformer winding is required and the circuit complexity can be minimized. The power unit can be properly operated under discontinuous conduction mode DCM or continuous conduction mode CCM . Problems such as “shoot-through” or “cross conduction” in CCM and energy-reverse from the secondary to the primary in DCM are prevented by the SG6203 design. System General Corp. Version IAO33.0010.B1 September 24, 2007 Synchronous Rectifier Controller for Flyback Converter Product Specification SG6203 MARKING DIAGRAMS PIN CONFIGURATION T D=DIP, S=SOP P Z=Lead Free + ROHS SG6203TP Compatible Output Wafer Lot Y Year WW Week V Assembly Location ORDERING INFORMATION Pb-Free Package SG6203SZ 8-Pin SOP SG6203DZ 8-Pin DIP PIN DESCRIPTIONS Pin Name Function Supply voltage of gate driver and control circuits. Totem-pole output to drive the synchronous power MOSFET. When the voltage on DET pin falls below 1.4V Output disabled once the voltage on IN+ pin is lower than that of IN- pin or the internal one-shot timer is terminated. The power ground and signal ground. A 0.1µF decoupling capacitor placed between VCC and GND is recommended. Built-in 18V Zener diode. When the flyback output voltage is higher than 18V, this pin can be used to provide a stable 18V to VCC pin. If the flyback output voltage is lower than 18V, this pin can be left open and the output voltage connected directly to VCC pin. Connecting a diode from this pin to the transformer secondary winding provides on/off information of the primary switch. Low DET level indicates the secondary rectifier is conducted, therefore the synchronous MOSFET should be turned on. DET stays high when the primary switch is conducting or secondary rectifier turns off and the synchronous MOSFET should be turned off. Current reference. Connecting a resistor from this pin to ground can program the internal current reference IRT. Three internal current sources, which are IIN+, IIN-, and IDET, are then mirrored from IRT. IRT determines the duration of the internal one-shot signal, then the maximum on-time of the synchronous MOSFET is obtained by subtracting the on-time of the primary switch from the one-shot signal duration. If the resistor is too small, the synchronous MOSFET may be turned off even when the secondary rectifier is still conducting, which decreases the system efficiency. However, if the resistor is too large, the output is shut off immediately once DET gets high. In SG6203, an internal phase-locked-loop PLL modulates the duration of the internal one-shot signal to maintain a suitable dead time between the primary switch and the synchronous MOSFET. System General Corp. Version IAO33.0010.B1 September 24, 2007 Synchronous Rectifier Controller for Flyback Converter BLOCK DIAGRAM Product Specification SG6203 System General Corp. Version IAO33.0010.B1 September 24, 2007 Synchronous Rectifier Controller for Flyback Converter Product Specification SG6203 ABSOLUTE MAXIMUM RATINGS Symbol Parameter DC Supply Voltage* IOUT Gate Output Current DET, OUT, VZ RT, IN+, IN- Power Dissipation TJ TSTG TL Thermal Resistance Junction-to-Air Operating Junction Temperature Storage Temperature Range Lead Temperature Soldering, 10 Seconds Electrostatic Discharge Capability, Human Body Model Electrostatic Discharge Capability, Machine Model SOP8 DIP8 SOP8 DIP8 * All voltage values, except differential voltages, are given with respect to GND pin. |
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